[Merkaartor] 0.11 Windows: crash when opening saved scene

[Norbert Wenzel]

Hi,

I've been offline this weekend. To do some mapping without being online 
I exported the area to an osm xml file before and saved that as mdc in 
merkaartor 0.11 under winxp. This worked fine for two days but without 
any great changes the file suddendly crashed merkaartor when opened with 
an access violation.

It's reproducable on my machine, so maybe if there is a pdb available I 
could try to do some further debugging. Otherwise I could share the mdc 
file, but I'm not sure if that would reproduce the error. I've got no 
other machine to check.

Another issue when reading the data of the mdc file (with a text editor) 
seems the command history. When adding a e.g. a name to a road every 
letter of the name is a new command. Wouldn't it be sufficient to store 
every changed name as one atomical step? Or even do not store any 
history information, since one could argue that saving a file would 
imply that the file is correct.

regards,
Norbert
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